Exam 2 Flashcards
Chapter 7 part 1
how many bones are in the body
206
why do the number of bones vary
(digits, ribs) decreases as Age with Fusion (~270 at Birth)
2 divisions of skeletal system
axial and appendicular
Skull, Ossicles, Hyoid, Vertebrae, Rib Cage
axial
Pectoral Girdle, Upper Limbs, pelvic girdle, lower limbs
appendicular
what develop in lambdoidal or coronal sutures
sutural bones/ wormian
number of bones in axial skeleton
80
number of bones in appendicular skeleton
126
projections include
processes
condyle
facets
rounded tubercle
crest
line
spine
tuberosity
trochanter
epicondyle
where tendon or ligament attach is called
processes
what do depressions include
depressions, groove, fossa, notch, meatus, fissure, foramen, also sinuses
a smooth flattened
surface covered with articular
cartilage and forms one side of
a joint
facet
a large rounded
protuberance covered with
articular cartilage forming the
other side of the joint
condyle
8 bones in cranium
Frontal, Parietal (2), Temporal (2), Occipital, Ethmoid, Sphenoid
what are sutures
(4) Immovable Joints with Jagged edges for Strength
coronal suture separates
frontal and parietal
squamosal separate
pariteal and temporal
sagittal separate
between parietal
lambdoidal separate
parietal and occipital
top of skull, removed to see interior
calvaria
what bone is the path for eyes and ears
cranium
attachment for muscles: facial expression, chewing, swallow, speech
cranium
forehead is
frontal
coronal suture , frontal sinus,
anterior cranial fossa- support frontal lobe
supraorbital foramen (BV and nerve for eye/eyelid)
frontal
what bone acts as a protective brain= sides and roof with a sagital and lambdoid suture
parietal
sutural bones (wormian). superior and inferior temporal line and (attachment sites for temporalis muscle- mastication= chew
parietal
how many bones in eye orbit
7
name the bones in the eye orbit
frontal, sphenoid, zygomatic, maxilla, lacrimal, ethmoid, palatine
tears from eye into nasal cavity is called
nasolacrimal canal
optic nerve
vision
CN III , IV, VI
superior orbital fissures
infraorbital artery vein and nerve
inferior orbital fissures
4 paranasal sinuses
frontal, ethmoid, sphenoid, maxilla
functions of the paransal sinus
decrease weight of skull and voice resonance
bridge of nose
nasal
what bone has inferior hyaline cartilage
nasal
cheekbones
zygomatic
how many facial bones
14
alveoli
teeth in upper jaw
incisive foramen
bv and nerves
infraorbital foramen
facial artery and nerve
hard palate consists of
anterior 2/3 and separates oral from nasal cavity
alveoli, incisive foramen, infraorbital foramen, and hard palate are in the
maxilla
hard palate (posterior 1/3) is in what bone
palatine
smallest skull bones
lacrimal
nasolacrimal duct to canal=tears
lacrimal
3rd set of nasal concha (increases surface area)
inferior nasal conchae
lower jaw
mandible
largest and strongest bone of face only movable
mandible
has 3 parts
mandible
small triagnular bone on floor of nasal cavity
vomer
what bone does NOT directly articulate with
other skeletal bones
(Sesamoid)
hyoid
Support for Speech &
Swallowing Muscles
hyoid
what bone easily fracture with blow to or squeezing neck
hyoid
how many bones in vertebral column
26
convex curve
cervical
ribs attached, concave curve
thoracic
convex curve, heaviest and strongest
lumbar
5 fused- articulates with pelvic girdle, concave
sacral
4 fused= tailbone
coccyx
Abnormal lateral rotation of spine
(C, T, L Curves)
Female > Male, Early Adolescence,
Idiopathic, Genetic
Breathing issues, Disabling, Psych
Treat with Surgery, Place rods
scoliosis
Exaggerated Curvature in Upper
Thoracic & Cervical Spine
May be due to Osteoporosis
Dowager’s Hump
kyphosis
Exaggerated Curvature of
Lumbar & Lower Thoracic Vertebrae
Due to weak Abdominal Muscles
(Diastasis Recti) in middle age/old males
Poor posture, Pregnancy Low back pain
Compensation to maintain center of gravity
lordosis
between vertebrae
intervertebral disc
Provide Flexibility to Vertebral Column & Shock
Absorber
intervertebral disc
Annalus fibrosus = Fibrous ring of CT
intervertebral disc
whats true about intervertebral disc at night vs morning
night is shorter by half an inch
Nucleus pulposus = Gelatinous (Leaks out =
Herniation) Treat with Laminectomy (Remove
part of Vertebral Lamina/Arch)
intervertebral disc
flat bone
sternum
the 3 fused bones in the sternum
manubrium, body, xiphoid process
where the manurbium and body meet and costal cartilage of 2nd rib articulates with sternum
sternal angle
how many pairs of ribs
12
true ribs are
1-7
false ribs are
8-10
floating ribs are
11 and 12